US5358652A
Expired / Lapsed
US
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Inhibiting hydrolytic degradation of hydrolyzable oleaginous fluids
Assignee: Afton Chemical Ltd
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Filing: 1992-10-26
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Granted: 1994-10-25
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Expires: 2012-10-26
Abstract
Abstract Hydrolytic degradation of oleaginous fluids susceptible to hydrolytic degradation in the presence of moisture and the development of acidity in adventitious water are inhibited by including in the oleaginous fluids at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two hydrogen atoms, by two organic groups, or by one hydrogen atom and one organic group. Other phenolic compounds such as hindered phenolic antioxidants are incapable of providing such protection against hydrolytic degradation and acid buildup.
Inventors
- 👤 Ian Macpherson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:06
CPC Classifications
C; C10; C10M; C10M133/00; C10M133/02; C10M133/04; C10M133/06; C10M133/08; C10M101/00; C10M101/04; C10M129/00; C10M129/02; C10M129/04; C10M129/10; C10M133/12; C10M133/52; C10M135/00; C10M135/02; C10M135/08; C10M135/10; C10M135/20; C10M135/32; C10M135/36; C10M137/00; C10M137/02; C10M137/04; C10M137/08; C10M137/10; C10M141/00; C10M141/06; C10M141/10; C10M159/00; C10M159/12; C10M159/16; C10M163/00; C10M169/00; C10M169/04; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/026; C10M2207/027; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/287; C10M2207/289; C10M2207/34; C10M2207/40; C10M2207/401; C10M2207/404; C10M2207/4045; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/102; C10M2209/103; C10M2209/104; C10M2209/109; C10M2209/11; C10M2209/111; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/066; C10M2215/067; C10M2215/068; C10M2215/22; C10M2215/221; C10M2215/223; C10M2215/224; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/30; C10M2217/00; C10M2217/04; C10M2217/042; C10M2217/043; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/02; C10M2219/022; C10M2219/04; C10M2219/042; C10M2219/044; C10M2219/046; C10M2219/08; C10M2219/082; C10M2219/087; C10M2219/088; C10M2219/089; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10M2219/108; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/043; C10M2223/045; C10M2223/047; C10M2223/049; C10M2223/06; C10M2223/061; C10M2223/10; C10M2227/00; C10M2227/06; C10M2227/061; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/041; C10M2229/05; C10N; C10N2040/00; C10N2040/02; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; C10N2040/08; C10N2040/20; C10N2040/22; C10N2040/25; C10N2040/251; C10N2040/255; C10N2040/28; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
A lubricant or functional fluid composition which comprises: a) a major proportion of a hydrolyzable oleaginous base fluid in contact with at least a small amount of water, wherein 50 to 100% by volume of said hydrolyzable oleaginous base fluid is composed of hydrolyzable oleaginous glyceride containing lecithin; and b. as a hydrolysis inhibitor and inhibitor of acidity buildup in adventitious water, a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary, or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two hydrogen atoms, by two organic groups, or by one hydrogen atom and one organic group, said oil-soluble compound stabilizing said composition against hydrolytic degradation in the presence of moisture.
Claim 2
Dependent Claim
127 words
A lubricant or functional fluid composition which comprises: a) a major proportion of a hydrolyzable oleaginous base fluid in contact with at least a small amount of water, wherein 50 to 100% by volume of said hydrolyzable oleaginous base fluid is composed of hydrolyzable oleaginous glyceride containing lecithin; and b. as a hydrolysis inhibitor and inhibitor of acidity buildup in adventitious water, a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary, or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two hydrogen atoms, by two organic groups, or by one hydrogen atom and one organic group, said oil-soluble compound stabilizing said composition against hydrolytic degradation in the presence of moisture.
Claim 3
Dependent Claim
14 words
A composition in accordance with claim 1 wherein said glyceride is a rapeseed oil.
Claim 4
Dependent Claim
15 words
A composition in accordance with claim 1 further including at least one oil-soluble rust inhibitor.
Claim 5
Dependent Claim
20 words
A composition in accordance with claim 3 further including at least one oil-soluble antioxidant in addition to said component b).
Claim 6
Dependent Claim
23 words
A composition in accordance with claim 4 further including at least one oil-soluble metal-free phosphorus-containing and/or metal-free sulphur-containing antiwear and/or extreme pressure agent.
Claim 7
Dependent Claim
16 words
A composition in accordance with claim 5 further including at least one oil-soluble copper corrosion inhibitor.
Claim 8
Dependent Claim
16 words
A composition in accordance with claim 6 wherein said component b) is at least one N-(3,5-dihydrocarbyl-4-hydroxybenzyl)-N,N-dialkylamine.
Claim 9
Dependent Claim
72 words
A composition in accordance with claim 3 containing one or more of the following: (i) as an antioxidant in addition to said component b), at least one oil-soluble phenolic antioxidant and at least one oil-soluble aromatic amine antioxidant; (ii) at least one oil-soluble metal-free phosphorus- and nitrogen-containing antiwear and/or extreme pressure agent; (iii) at least one oil-soluble metal-free sulphurized ester; and/or (iv) at least one oil-soluble thiazole or triazole copper corrosion inhibitor.
Claim 10
Dependent Claim
33 words
A composition in accordance with claim 8 wherein said composition is essentially free of halogen-containing additive components and wherein the total metal content of metal-containing additives, if any, is 100 ppm or less.
Claim 11
Dependent Claim
15 words
A composition in accordance with claim 9 wherein said composition is a hydraulic fluid composition.
Claim 12
Independent Claim
145 words
A method of inhibiting hydrolytic degradation of a hydrolyzable oleaginous lubricant or functional fluid composition in the presence of moisture, which method comprises including in said composition, (a) a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two hydrogen atoms, by two organic groups, or by one hydrogen atom and one organic group and (b) a minor amount of (i) at least one oil-soluble rust inhibitor; (ii) at least one oil-soluble antioxidant in addition to said component a; (iii) at least one oil-soluble metal-free phosphorous-containing and/or metal-free sulphur-containing antiwear and/or extreme pressure agent; and (iv) at least one oil-soluble copper corrosion inhibitor, whereby said composition is stabilized against hydrolytic degradation and acid formation in the presence of adventitious water.
Claim 13
Independent Claim
145 words
A method of inhibiting hydrolytic degradation of a hydrolyzable oleaginous lubricant or functional fluid composition in the presence of moisture, which method comprises including in said composition, (a) a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two hydrogen atoms, by two organic groups, or by one hydrogen atom and one organic group and (b) a minor amount of (i) at least one oil-soluble rust inhibitor; (ii) at least one oil-soluble antioxidant in addition to said component a; (iii) at least one oil-soluble metal-free phosphorous-containing and/or metal-free sulphur-containing antiwear and/or extreme pressure agent; and (iv) at least one oil-soluble copper corrosion inhibitor, whereby said composition is stabilized against hydrolytic degradation and acid formation in the presence of adventitious water.
Claim 14
Dependent Claim
28 words
A method of operating an apparatus which contains an oleaginous lubricant or functional fluid, which method comprises introducing into said apparatus a composition in accordance with claim 8.
Claim 15
Dependent Claim
30 words
A method of operating apparatus in accordance with claim 12 wherein the apparatus is a hydraulic system and wherein said oleaginous lubricant or functional fluid composition is a hydraulic fluid.
Claim 16
Dependent Claim
115 words
An additive concentrate which comprises: (i) as a hydrolysis inhibitor and inhibitor of acidity build-up in adventitious water, a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two hydrogen atoms, by two organic groups, or by one hydrogen atom and one organic group; and (ii) at least one oil-soluble rust inhibitor; and (iii) at least one oil-soluble antioxidant in addition to said component (i); and (iv) at least one oil-soluble metal-free phosphorus-containing and/or metal-free sulphur-containing antiwear and/or extreme pressure agent; and (v) at least one oil-soluble copper corrosion inhibitor.
Claim 17
Dependent Claim
115 words
An additive concentrate which comprises: (i) as a hydrolysis inhibitor and inhibitor of acidity build-up in adventitious water, a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two hydrogen atoms, by two organic groups, or by one hydrogen atom and one organic group; and (ii) at least one oil-soluble rust inhibitor; and (iii) at least one oil-soluble antioxidant in addition to said component (i); and (iv) at least one oil-soluble metal-free phosphorus-containing and/or metal-free sulphur-containing antiwear and/or extreme pressure agent; and (v) at least one oil-soluble copper corrosion inhibitor.
Claim 18
Dependent Claim
103 words
A lubricant or functional fluid composition which comprises: a. a major proportion of a hydrolyzable oleaginous base fluid in contact with at least a small amount of water; and b. as a hydrolysis inhibitor and inhibitor of acidity buildup in adventitious water, a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary, or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two organic groups, or by one hydrogen atom and one organic group, said oil-soluble compound stabilizing said composition against hydrolytic degradation in the presence of moisture.
Claim 19
Dependent Claim
103 words
A lubricant or functional fluid composition which comprises: a. a major proportion of a hydrolyzable oleaginous base fluid in contact with at least a small amount of water; and b. as a hydrolysis inhibitor and inhibitor of acidity buildup in adventitious water, a minor amount of at least one oil-soluble compound containing at least one 3,5-dihydrocarbyl-4-hydroxybenzyl group attached to a primary, secondary, or tertiary amino nitrogen atom, the two alpha-positions of the benzyl group being substituted by two organic groups, or by one hydrogen atom and one organic group, said oil-soluble compound stabilizing said composition against hydrolytic degradation in the presence of moisture.
Claim 20
Dependent Claim
15 words
A composition in accordance with claim 15 further including at least one oil-soluble rust inhibitor.
Claim 21
Dependent Claim
72 words
A composition in accordance with claim 16 containing one or more of the following: (i) as an antioxidant in addition to said component b), at least one oil-soluble phenolic antioxidant and at least one oil-soluble aromatic amine antioxidant; (ii) at least one oil-soluble metal-free phosphorus- and nitrogen-containing antiwear and/or extreme pressure agent; (iii) at least one oil-soluble metal-free sulphurized ester; and/or (iv) at least one oil-soluble thiazole or triazole copper corrosion inhibitor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |